1 : Make de module structure..
2 : Add it modules with admin user
3 : in the groups, select a group, like "demogroup", select the "south" panel
4 : and in "selected modules", select "Example3", must be in last place of grid.
5 : after this, you must select "user" and right panel you must deselect and select the "demogroup" to reaload the permisions to the user.
6: reload the "extdesk" with user and the "Example3" must be appear.